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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586f3c3942810c836bc46aea50dadeaeab9a0a846247f49409267d485e430f67' 
  AND token = 'sIx4VIC9e1GKuks28ThiT/tmG0Bjcpr/tStPs548evE=' 
  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"
    }
  }
}