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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7f24677202fd2e2df9d89a8f67a0ab6f77f504c7d74dfe79968a9e30b539ef' 
  AND token = 'xnM0/AbX6jEhQKNcOBPoFNi45bunfhtqIxKY59P5w7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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