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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a0a025e3442fa448ab3a1f96ac4f6e35c29098a45e140a5b3fa84f11116ad57' 
  AND token = 'LPJC/GqJ2XImP9dX7MUHl/lCgI6NDpDZae23Lhw4tKM=' 
  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"
    }
  }
}