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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd7fda464887696cc5679cb6fab628763d95d178d84d4795ff697622d61ba79' 
  AND token = 'GPYP11iUWUTEG+oTW/e+68Tk7uUP+KE3viMt1KLabBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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