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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf587068f671e04b4e4489d36549e178870f18f19a2e971c3b3de82de551ba4' 
  AND token = '2GmTPGwTPxb7e6V/PyBjV1yzaUNyS9KT7OyaGoKC5KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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