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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ea8c22441b1f8e6bf5c7f32c97c7b1e2768453d40bcea34d062a5fd8cb2a0a' 
  AND token = '01HCiwCqE7qGJPefzDzgGs/uJJjHmUpNqdzuD/zf6e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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