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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e32745ffc0173a2abd08114308042b1ac7a554a498a069cda49fe15c1cd65b15' 
  AND token = 'rR55aFEAhRmGkN5k7s4L6x12VUo0g2wnthnI/Yb7krs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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