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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f639a8ac2d207a0955b9182f91c9e4964efc3b83a3ecab71ebf1aeebcfe9cf6' 
  AND token = 'OaRlpSM1F+asKqbrl08/6bA5tN2/Ncc+N/rWgBvKS6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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