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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b430a9086f670131cacb2bc8aa9f2f5c9aeeb31ef9b390be8c2116569660f870' 
  AND token = 'm4FT+NPdw5gtFjasG2+jpVuUGTeCRqzKoRdRJ0qkc2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}